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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/kvm.git] / drivers / net / ibmveth.c
blobb388d782c7c40cbbd84cc4eca875daa4709b20d4
1 /*
2 * IBM Power Virtual Ethernet Device Driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright (C) IBM Corporation, 2003, 2010
19 *
20 * Authors: Dave Larson <larson1@us.ibm.com>
21 * Santiago Leon <santil@linux.vnet.ibm.com>
22 * Brian King <brking@linux.vnet.ibm.com>
23 * Robert Jennings <rcj@linux.vnet.ibm.com>
24 * Anton Blanchard <anton@au.ibm.com>
25 */
26
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/kernel.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/init.h>
37 #include <linux/mm.h>
38 #include <linux/pm.h>
39 #include <linux/ethtool.h>
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 #include <linux/slab.h>
44 #include <asm/hvcall.h>
45 #include <asm/atomic.h>
46 #include <asm/vio.h>
47 #include <asm/iommu.h>
48 #include <asm/firmware.h>
49
50 #include "ibmveth.h"
51
52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
55
56 static struct kobj_type ktype_veth_pool;
57
58
59 static const char ibmveth_driver_name[] = "ibmveth";
60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
61 #define ibmveth_driver_version "1.04"
62
63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
65 MODULE_LICENSE("GPL");
66 MODULE_VERSION(ibmveth_driver_version);
67
68 static unsigned int tx_copybreak __read_mostly = 128;
69 module_param(tx_copybreak, uint, 0644);
70 MODULE_PARM_DESC(tx_copybreak,
71 "Maximum size of packet that is copied to a new buffer on transmit");
72
73 static unsigned int rx_copybreak __read_mostly = 128;
74 module_param(rx_copybreak, uint, 0644);
75 MODULE_PARM_DESC(rx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on receive");
77
78 static unsigned int rx_flush __read_mostly = 0;
79 module_param(rx_flush, uint, 0644);
80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
81
82 struct ibmveth_stat {
83 char name[ETH_GSTRING_LEN];
84 int offset;
85 };
86
87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
89
90 struct ibmveth_stat ibmveth_stats[] = {
91 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
92 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
93 { "replenish_add_buff_failure",
94 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
95 { "replenish_add_buff_success",
96 IBMVETH_STAT_OFF(replenish_add_buff_success) },
97 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
98 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
99 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
100 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
101 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
102 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
103 };
104
105 /* simple methods of getting data from the current rxq entry */
106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
107 {
108 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
109 }
110
111 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
112 {
113 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
114 IBMVETH_RXQ_TOGGLE_SHIFT;
115 }
116
117 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
118 {
119 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
120 }
121
122 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
123 {
124 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
125 }
126
127 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
128 {
129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
130 }
131
132 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
133 {
134 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
135 }
136
137 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
138 {
139 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
140 }
141
142 /* setup the initial settings for a buffer pool */
143 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
144 u32 pool_index, u32 pool_size,
145 u32 buff_size, u32 pool_active)
146 {
147 pool->size = pool_size;
148 pool->index = pool_index;
149 pool->buff_size = buff_size;
150 pool->threshold = pool_size * 7 / 8;
151 pool->active = pool_active;
152 }
153
154 /* allocate and setup an buffer pool - called during open */
155 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
156 {
157 int i;
158
159 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
160
161 if (!pool->free_map)
162 return -1;
163
164 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
165 if (!pool->dma_addr) {
166 kfree(pool->free_map);
167 pool->free_map = NULL;
168 return -1;
169 }
170
171 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
172
173 if (!pool->skbuff) {
174 kfree(pool->dma_addr);
175 pool->dma_addr = NULL;
176
177 kfree(pool->free_map);
178 pool->free_map = NULL;
179 return -1;
180 }
181
182 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192 }
193
194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195 {
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200 }
201
202 /* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207 {
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277 failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293 }
294
295 /* replenish routine */
296 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
297 {
298 int i;
299
300 adapter->replenish_task_cycles++;
301
302 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
303 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
304
305 if (pool->active &&
306 (atomic_read(&pool->available) < pool->threshold))
307 ibmveth_replenish_buffer_pool(adapter, pool);
308 }
309
310 adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
311 4096 - 8);
312 }
313
314 /* empty and free ana buffer pool - also used to do cleanup in error paths */
315 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
316 struct ibmveth_buff_pool *pool)
317 {
318 int i;
319
320 kfree(pool->free_map);
321 pool->free_map = NULL;
322
323 if (pool->skbuff && pool->dma_addr) {
324 for (i = 0; i < pool->size; ++i) {
325 struct sk_buff *skb = pool->skbuff[i];
326 if (skb) {
327 dma_unmap_single(&adapter->vdev->dev,
328 pool->dma_addr[i],
329 pool->buff_size,
330 DMA_FROM_DEVICE);
331 dev_kfree_skb_any(skb);
332 pool->skbuff[i] = NULL;
333 }
334 }
335 }
336
337 if (pool->dma_addr) {
338 kfree(pool->dma_addr);
339 pool->dma_addr = NULL;
340 }
341
342 if (pool->skbuff) {
343 kfree(pool->skbuff);
344 pool->skbuff = NULL;
345 }
346 }
347
348 /* remove a buffer from a pool */
349 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
350 u64 correlator)
351 {
352 unsigned int pool = correlator >> 32;
353 unsigned int index = correlator & 0xffffffffUL;
354 unsigned int free_index;
355 struct sk_buff *skb;
356
357 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
358 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
359
360 skb = adapter->rx_buff_pool[pool].skbuff[index];
361
362 BUG_ON(skb == NULL);
363
364 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
365
366 dma_unmap_single(&adapter->vdev->dev,
367 adapter->rx_buff_pool[pool].dma_addr[index],
368 adapter->rx_buff_pool[pool].buff_size,
369 DMA_FROM_DEVICE);
370
371 free_index = adapter->rx_buff_pool[pool].producer_index;
372 adapter->rx_buff_pool[pool].producer_index++;
373 if (adapter->rx_buff_pool[pool].producer_index >=
374 adapter->rx_buff_pool[pool].size)
375 adapter->rx_buff_pool[pool].producer_index = 0;
376 adapter->rx_buff_pool[pool].free_map[free_index] = index;
377
378 mb();
379
380 atomic_dec(&(adapter->rx_buff_pool[pool].available));
381 }
382
383 /* get the current buffer on the rx queue */
384 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
385 {
386 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
387 unsigned int pool = correlator >> 32;
388 unsigned int index = correlator & 0xffffffffUL;
389
390 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
391 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
392
393 return adapter->rx_buff_pool[pool].skbuff[index];
394 }
395
396 /* recycle the current buffer on the rx queue */
397 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
398 {
399 u32 q_index = adapter->rx_queue.index;
400 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
401 unsigned int pool = correlator >> 32;
402 unsigned int index = correlator & 0xffffffffUL;
403 union ibmveth_buf_desc desc;
404 unsigned long lpar_rc;
405
406 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
407 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
408
409 if (!adapter->rx_buff_pool[pool].active) {
410 ibmveth_rxq_harvest_buffer(adapter);
411 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
412 return;
413 }
414
415 desc.fields.flags_len = IBMVETH_BUF_VALID |
416 adapter->rx_buff_pool[pool].buff_size;
417 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
418
419 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
420
421 if (lpar_rc != H_SUCCESS) {
422 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
423 "during recycle rc=%ld", lpar_rc);
424 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
425 }
426
427 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
428 adapter->rx_queue.index = 0;
429 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
430 }
431 }
432
433 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
434 {
435 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
436
437 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
438 adapter->rx_queue.index = 0;
439 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
440 }
441 }
442
443 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
444 {
445 int i;
446 struct device *dev = &adapter->vdev->dev;
447
448 if (adapter->buffer_list_addr != NULL) {
449 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
450 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
451 DMA_BIDIRECTIONAL);
452 adapter->buffer_list_dma = DMA_ERROR_CODE;
453 }
454 free_page((unsigned long)adapter->buffer_list_addr);
455 adapter->buffer_list_addr = NULL;
456 }
457
458 if (adapter->filter_list_addr != NULL) {
459 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
460 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
461 DMA_BIDIRECTIONAL);
462 adapter->filter_list_dma = DMA_ERROR_CODE;
463 }
464 free_page((unsigned long)adapter->filter_list_addr);
465 adapter->filter_list_addr = NULL;
466 }
467
468 if (adapter->rx_queue.queue_addr != NULL) {
469 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
470 dma_unmap_single(dev,
471 adapter->rx_queue.queue_dma,
472 adapter->rx_queue.queue_len,
473 DMA_BIDIRECTIONAL);
474 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
475 }
476 kfree(adapter->rx_queue.queue_addr);
477 adapter->rx_queue.queue_addr = NULL;
478 }
479
480 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
481 if (adapter->rx_buff_pool[i].active)
482 ibmveth_free_buffer_pool(adapter,
483 &adapter->rx_buff_pool[i]);
484
485 if (adapter->bounce_buffer != NULL) {
486 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
487 dma_unmap_single(&adapter->vdev->dev,
488 adapter->bounce_buffer_dma,
489 adapter->netdev->mtu + IBMVETH_BUFF_OH,
490 DMA_BIDIRECTIONAL);
491 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
492 }
493 kfree(adapter->bounce_buffer);
494 adapter->bounce_buffer = NULL;
495 }
496 }
497
498 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
499 union ibmveth_buf_desc rxq_desc, u64 mac_address)
500 {
501 int rc, try_again = 1;
502
503 /*
504 * After a kexec the adapter will still be open, so our attempt to
505 * open it will fail. So if we get a failure we free the adapter and
506 * try again, but only once.
507 */
508 retry:
509 rc = h_register_logical_lan(adapter->vdev->unit_address,
510 adapter->buffer_list_dma, rxq_desc.desc,
511 adapter->filter_list_dma, mac_address);
512
513 if (rc != H_SUCCESS && try_again) {
514 do {
515 rc = h_free_logical_lan(adapter->vdev->unit_address);
516 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
517
518 try_again = 0;
519 goto retry;
520 }
521
522 return rc;
523 }
524
525 static int ibmveth_open(struct net_device *netdev)
526 {
527 struct ibmveth_adapter *adapter = netdev_priv(netdev);
528 u64 mac_address = 0;
529 int rxq_entries = 1;
530 unsigned long lpar_rc;
531 int rc;
532 union ibmveth_buf_desc rxq_desc;
533 int i;
534 struct device *dev;
535
536 netdev_dbg(netdev, "open starting\n");
537
538 napi_enable(&adapter->napi);
539
540 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
541 rxq_entries += adapter->rx_buff_pool[i].size;
542
543 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
544 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
545
546 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
547 netdev_err(netdev, "unable to allocate filter or buffer list "
548 "pages\n");
549 rc = -ENOMEM;
550 goto err_out;
551 }
552
553 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
554 rxq_entries;
555 adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len,
556 GFP_KERNEL);
557
558 if (!adapter->rx_queue.queue_addr) {
559 netdev_err(netdev, "unable to allocate rx queue pages\n");
560 rc = -ENOMEM;
561 goto err_out;
562 }
563
564 dev = &adapter->vdev->dev;
565
566 adapter->buffer_list_dma = dma_map_single(dev,
567 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
568 adapter->filter_list_dma = dma_map_single(dev,
569 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
570 adapter->rx_queue.queue_dma = dma_map_single(dev,
571 adapter->rx_queue.queue_addr,
572 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
573
574 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
575 (dma_mapping_error(dev, adapter->filter_list_dma)) ||
576 (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
577 netdev_err(netdev, "unable to map filter or buffer list "
578 "pages\n");
579 rc = -ENOMEM;
580 goto err_out;
581 }
582
583 adapter->rx_queue.index = 0;
584 adapter->rx_queue.num_slots = rxq_entries;
585 adapter->rx_queue.toggle = 1;
586
587 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
588 mac_address = mac_address >> 16;
589
590 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
591 adapter->rx_queue.queue_len;
592 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
593
594 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
595 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
596 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
597
598 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
599
600 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
601
602 if (lpar_rc != H_SUCCESS) {
603 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
604 lpar_rc);
605 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
606 "desc:0x%llx MAC:0x%llx\n",
607 adapter->buffer_list_dma,
608 adapter->filter_list_dma,
609 rxq_desc.desc,
610 mac_address);
611 rc = -ENONET;
612 goto err_out;
613 }
614
615 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
616 if (!adapter->rx_buff_pool[i].active)
617 continue;
618 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
619 netdev_err(netdev, "unable to alloc pool\n");
620 adapter->rx_buff_pool[i].active = 0;
621 rc = -ENOMEM;
622 goto err_out;
623 }
624 }
625
626 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
627 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
628 netdev);
629 if (rc != 0) {
630 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
631 netdev->irq, rc);
632 do {
633 rc = h_free_logical_lan(adapter->vdev->unit_address);
634 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
635
636 goto err_out;
637 }
638
639 adapter->bounce_buffer =
640 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
641 if (!adapter->bounce_buffer) {
642 netdev_err(netdev, "unable to allocate bounce buffer\n");
643 rc = -ENOMEM;
644 goto err_out_free_irq;
645 }
646 adapter->bounce_buffer_dma =
647 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
648 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
649 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
650 netdev_err(netdev, "unable to map bounce buffer\n");
651 rc = -ENOMEM;
652 goto err_out_free_irq;
653 }
654
655 netdev_dbg(netdev, "initial replenish cycle\n");
656 ibmveth_interrupt(netdev->irq, netdev);
657
658 netif_start_queue(netdev);
659
660 netdev_dbg(netdev, "open complete\n");
661
662 return 0;
663
664 err_out_free_irq:
665 free_irq(netdev->irq, netdev);
666 err_out:
667 ibmveth_cleanup(adapter);
668 napi_disable(&adapter->napi);
669 return rc;
670 }
671
672 static int ibmveth_close(struct net_device *netdev)
673 {
674 struct ibmveth_adapter *adapter = netdev_priv(netdev);
675 long lpar_rc;
676
677 netdev_dbg(netdev, "close starting\n");
678
679 napi_disable(&adapter->napi);
680
681 if (!adapter->pool_config)
682 netif_stop_queue(netdev);
683
684 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
685
686 do {
687 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
688 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
689
690 if (lpar_rc != H_SUCCESS) {
691 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
692 "continuing with close\n", lpar_rc);
693 }
694
695 free_irq(netdev->irq, netdev);
696
697 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
698 4096 - 8);
699
700 ibmveth_cleanup(adapter);
701
702 netdev_dbg(netdev, "close complete\n");
703
704 return 0;
705 }
706
707 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
708 {
709 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
710 SUPPORTED_FIBRE);
711 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
712 ADVERTISED_FIBRE);
713 ethtool_cmd_speed_set(cmd, SPEED_1000);
714 cmd->duplex = DUPLEX_FULL;
715 cmd->port = PORT_FIBRE;
716 cmd->phy_address = 0;
717 cmd->transceiver = XCVR_INTERNAL;
718 cmd->autoneg = AUTONEG_ENABLE;
719 cmd->maxtxpkt = 0;
720 cmd->maxrxpkt = 1;
721 return 0;
722 }
723
724 static void netdev_get_drvinfo(struct net_device *dev,
725 struct ethtool_drvinfo *info)
726 {
727 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
728 strncpy(info->version, ibmveth_driver_version,
729 sizeof(info->version) - 1);
730 }
731
732 static u32 ibmveth_fix_features(struct net_device *dev, u32 features)
733 {
734 /*
735 * Since the ibmveth firmware interface does not have the
736 * concept of separate tx/rx checksum offload enable, if rx
737 * checksum is disabled we also have to disable tx checksum
738 * offload. Once we disable rx checksum offload, we are no
739 * longer allowed to send tx buffers that are not properly
740 * checksummed.
741 */
742
743 if (!(features & NETIF_F_RXCSUM))
744 features &= ~NETIF_F_ALL_CSUM;
745
746 return features;
747 }
748
749 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
750 {
751 struct ibmveth_adapter *adapter = netdev_priv(dev);
752 unsigned long set_attr, clr_attr, ret_attr;
753 unsigned long set_attr6, clr_attr6;
754 long ret, ret6;
755 int rc1 = 0, rc2 = 0;
756 int restart = 0;
757
758 if (netif_running(dev)) {
759 restart = 1;
760 adapter->pool_config = 1;
761 ibmveth_close(dev);
762 adapter->pool_config = 0;
763 }
764
765 set_attr = 0;
766 clr_attr = 0;
767
768 if (data) {
769 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
770 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
771 } else {
772 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
773 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
774 }
775
776 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
777
778 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
779 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
780 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
781 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
782 set_attr, &ret_attr);
783
784 if (ret != H_SUCCESS) {
785 netdev_err(dev, "unable to change IPv4 checksum "
786 "offload settings. %d rc=%ld\n",
787 data, ret);
788
789 ret = h_illan_attributes(adapter->vdev->unit_address,
790 set_attr, clr_attr, &ret_attr);
791 } else {
792 adapter->fw_ipv4_csum_support = data;
793 }
794
795 ret6 = h_illan_attributes(adapter->vdev->unit_address,
796 clr_attr6, set_attr6, &ret_attr);
797
798 if (ret6 != H_SUCCESS) {
799 netdev_err(dev, "unable to change IPv6 checksum "
800 "offload settings. %d rc=%ld\n",
801 data, ret);
802
803 ret = h_illan_attributes(adapter->vdev->unit_address,
804 set_attr6, clr_attr6,
805 &ret_attr);
806 } else
807 adapter->fw_ipv6_csum_support = data;
808
809 if (ret != H_SUCCESS || ret6 != H_SUCCESS)
810 adapter->rx_csum = data;
811 else
812 rc1 = -EIO;
813 } else {
814 rc1 = -EIO;
815 netdev_err(dev, "unable to change checksum offload settings."
816 " %d rc=%ld ret_attr=%lx\n", data, ret,
817 ret_attr);
818 }
819
820 if (restart)
821 rc2 = ibmveth_open(dev);
822
823 return rc1 ? rc1 : rc2;
824 }
825
826 static int ibmveth_set_features(struct net_device *dev, u32 features)
827 {
828 struct ibmveth_adapter *adapter = netdev_priv(dev);
829 int rx_csum = !!(features & NETIF_F_RXCSUM);
830 int rc;
831
832 if (rx_csum == adapter->rx_csum)
833 return 0;
834
835 rc = ibmveth_set_csum_offload(dev, rx_csum);
836 if (rc && !adapter->rx_csum)
837 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
838
839 return rc;
840 }
841
842 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
843 {
844 int i;
845
846 if (stringset != ETH_SS_STATS)
847 return;
848
849 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
850 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
851 }
852
853 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
854 {
855 switch (sset) {
856 case ETH_SS_STATS:
857 return ARRAY_SIZE(ibmveth_stats);
858 default:
859 return -EOPNOTSUPP;
860 }
861 }
862
863 static void ibmveth_get_ethtool_stats(struct net_device *dev,
864 struct ethtool_stats *stats, u64 *data)
865 {
866 int i;
867 struct ibmveth_adapter *adapter = netdev_priv(dev);
868
869 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
870 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
871 }
872
873 static const struct ethtool_ops netdev_ethtool_ops = {
874 .get_drvinfo = netdev_get_drvinfo,
875 .get_settings = netdev_get_settings,
876 .get_link = ethtool_op_get_link,
877 .get_strings = ibmveth_get_strings,
878 .get_sset_count = ibmveth_get_sset_count,
879 .get_ethtool_stats = ibmveth_get_ethtool_stats,
880 };
881
882 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
883 {
884 return -EOPNOTSUPP;
885 }
886
887 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
888
889 static int ibmveth_send(struct ibmveth_adapter *adapter,
890 union ibmveth_buf_desc *descs)
891 {
892 unsigned long correlator;
893 unsigned int retry_count;
894 unsigned long ret;
895
896 /*
897 * The retry count sets a maximum for the number of broadcast and
898 * multicast destinations within the system.
899 */
900 retry_count = 1024;
901 correlator = 0;
902 do {
903 ret = h_send_logical_lan(adapter->vdev->unit_address,
904 descs[0].desc, descs[1].desc,
905 descs[2].desc, descs[3].desc,
906 descs[4].desc, descs[5].desc,
907 correlator, &correlator);
908 } while ((ret == H_BUSY) && (retry_count--));
909
910 if (ret != H_SUCCESS && ret != H_DROPPED) {
911 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
912 "with rc=%ld\n", ret);
913 return 1;
914 }
915
916 return 0;
917 }
918
919 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
920 struct net_device *netdev)
921 {
922 struct ibmveth_adapter *adapter = netdev_priv(netdev);
923 unsigned int desc_flags;
924 union ibmveth_buf_desc descs[6];
925 int last, i;
926 int force_bounce = 0;
927
928 /*
929 * veth handles a maximum of 6 segments including the header, so
930 * we have to linearize the skb if there are more than this.
931 */
932 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
933 netdev->stats.tx_dropped++;
934 goto out;
935 }
936
937 /* veth can't checksum offload UDP */
938 if (skb->ip_summed == CHECKSUM_PARTIAL &&
939 ((skb->protocol == htons(ETH_P_IP) &&
940 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
941 (skb->protocol == htons(ETH_P_IPV6) &&
942 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
943 skb_checksum_help(skb)) {
944
945 netdev_err(netdev, "tx: failed to checksum packet\n");
946 netdev->stats.tx_dropped++;
947 goto out;
948 }
949
950 desc_flags = IBMVETH_BUF_VALID;
951
952 if (skb->ip_summed == CHECKSUM_PARTIAL) {
953 unsigned char *buf = skb_transport_header(skb) +
954 skb->csum_offset;
955
956 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
957
958 /* Need to zero out the checksum */
959 buf[0] = 0;
960 buf[1] = 0;
961 }
962
963 retry_bounce:
964 memset(descs, 0, sizeof(descs));
965
966 /*
967 * If a linear packet is below the rx threshold then
968 * copy it into the static bounce buffer. This avoids the
969 * cost of a TCE insert and remove.
970 */
971 if (force_bounce || (!skb_is_nonlinear(skb) &&
972 (skb->len < tx_copybreak))) {
973 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
974 skb->len);
975
976 descs[0].fields.flags_len = desc_flags | skb->len;
977 descs[0].fields.address = adapter->bounce_buffer_dma;
978
979 if (ibmveth_send(adapter, descs)) {
980 adapter->tx_send_failed++;
981 netdev->stats.tx_dropped++;
982 } else {
983 netdev->stats.tx_packets++;
984 netdev->stats.tx_bytes += skb->len;
985 }
986
987 goto out;
988 }
989
990 /* Map the header */
991 descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
992 skb_headlen(skb),
993 DMA_TO_DEVICE);
994 if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
995 goto map_failed;
996
997 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
998
999 /* Map the frags */
1000 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1001 unsigned long dma_addr;
1002 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1003
1004 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1005 frag->page_offset, frag->size,
1006 DMA_TO_DEVICE);
1007
1008 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1009 goto map_failed_frags;
1010
1011 descs[i+1].fields.flags_len = desc_flags | frag->size;
1012 descs[i+1].fields.address = dma_addr;
1013 }
1014
1015 if (ibmveth_send(adapter, descs)) {
1016 adapter->tx_send_failed++;
1017 netdev->stats.tx_dropped++;
1018 } else {
1019 netdev->stats.tx_packets++;
1020 netdev->stats.tx_bytes += skb->len;
1021 }
1022
1023 for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
1024 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1025 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1026 DMA_TO_DEVICE);
1027
1028 out:
1029 dev_kfree_skb(skb);
1030 return NETDEV_TX_OK;
1031
1032 map_failed_frags:
1033 last = i+1;
1034 for (i = 0; i < last; i++)
1035 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1036 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1037 DMA_TO_DEVICE);
1038
1039 map_failed:
1040 if (!firmware_has_feature(FW_FEATURE_CMO))
1041 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1042 adapter->tx_map_failed++;
1043 skb_linearize(skb);
1044 force_bounce = 1;
1045 goto retry_bounce;
1046 }
1047
1048 static int ibmveth_poll(struct napi_struct *napi, int budget)
1049 {
1050 struct ibmveth_adapter *adapter =
1051 container_of(napi, struct ibmveth_adapter, napi);
1052 struct net_device *netdev = adapter->netdev;
1053 int frames_processed = 0;
1054 unsigned long lpar_rc;
1055
1056 restart_poll:
1057 do {
1058 if (!ibmveth_rxq_pending_buffer(adapter))
1059 break;
1060
1061 smp_rmb();
1062 if (!ibmveth_rxq_buffer_valid(adapter)) {
1063 wmb(); /* suggested by larson1 */
1064 adapter->rx_invalid_buffer++;
1065 netdev_dbg(netdev, "recycling invalid buffer\n");
1066 ibmveth_rxq_recycle_buffer(adapter);
1067 } else {
1068 struct sk_buff *skb, *new_skb;
1069 int length = ibmveth_rxq_frame_length(adapter);
1070 int offset = ibmveth_rxq_frame_offset(adapter);
1071 int csum_good = ibmveth_rxq_csum_good(adapter);
1072
1073 skb = ibmveth_rxq_get_buffer(adapter);
1074
1075 new_skb = NULL;
1076 if (length < rx_copybreak)
1077 new_skb = netdev_alloc_skb(netdev, length);
1078
1079 if (new_skb) {
1080 skb_copy_to_linear_data(new_skb,
1081 skb->data + offset,
1082 length);
1083 if (rx_flush)
1084 ibmveth_flush_buffer(skb->data,
1085 length + offset);
1086 skb = new_skb;
1087 ibmveth_rxq_recycle_buffer(adapter);
1088 } else {
1089 ibmveth_rxq_harvest_buffer(adapter);
1090 skb_reserve(skb, offset);
1091 }
1092
1093 skb_put(skb, length);
1094 skb->protocol = eth_type_trans(skb, netdev);
1095
1096 if (csum_good)
1097 skb->ip_summed = CHECKSUM_UNNECESSARY;
1098
1099 netif_receive_skb(skb); /* send it up */
1100
1101 netdev->stats.rx_packets++;
1102 netdev->stats.rx_bytes += length;
1103 frames_processed++;
1104 }
1105 } while (frames_processed < budget);
1106
1107 ibmveth_replenish_task(adapter);
1108
1109 if (frames_processed < budget) {
1110 /* We think we are done - reenable interrupts,
1111 * then check once more to make sure we are done.
1112 */
1113 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1114 VIO_IRQ_ENABLE);
1115
1116 BUG_ON(lpar_rc != H_SUCCESS);
1117
1118 napi_complete(napi);
1119
1120 if (ibmveth_rxq_pending_buffer(adapter) &&
1121 napi_reschedule(napi)) {
1122 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1123 VIO_IRQ_DISABLE);
1124 goto restart_poll;
1125 }
1126 }
1127
1128 return frames_processed;
1129 }
1130
1131 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1132 {
1133 struct net_device *netdev = dev_instance;
1134 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1135 unsigned long lpar_rc;
1136
1137 if (napi_schedule_prep(&adapter->napi)) {
1138 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1139 VIO_IRQ_DISABLE);
1140 BUG_ON(lpar_rc != H_SUCCESS);
1141 __napi_schedule(&adapter->napi);
1142 }
1143 return IRQ_HANDLED;
1144 }
1145
1146 static void ibmveth_set_multicast_list(struct net_device *netdev)
1147 {
1148 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1149 unsigned long lpar_rc;
1150
1151 if ((netdev->flags & IFF_PROMISC) ||
1152 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1153 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1154 IbmVethMcastEnableRecv |
1155 IbmVethMcastDisableFiltering,
1156 0);
1157 if (lpar_rc != H_SUCCESS) {
1158 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1159 "entering promisc mode\n", lpar_rc);
1160 }
1161 } else {
1162 struct netdev_hw_addr *ha;
1163 /* clear the filter table & disable filtering */
1164 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1165 IbmVethMcastEnableRecv |
1166 IbmVethMcastDisableFiltering |
1167 IbmVethMcastClearFilterTable,
1168 0);
1169 if (lpar_rc != H_SUCCESS) {
1170 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1171 "attempting to clear filter table\n",
1172 lpar_rc);
1173 }
1174 /* add the addresses to the filter table */
1175 netdev_for_each_mc_addr(ha, netdev) {
1176 /* add the multicast address to the filter table */
1177 unsigned long mcast_addr = 0;
1178 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1179 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1180 IbmVethMcastAddFilter,
1181 mcast_addr);
1182 if (lpar_rc != H_SUCCESS) {
1183 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1184 "when adding an entry to the filter "
1185 "table\n", lpar_rc);
1186 }
1187 }
1188
1189 /* re-enable filtering */
1190 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1191 IbmVethMcastEnableFiltering,
1192 0);
1193 if (lpar_rc != H_SUCCESS) {
1194 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1195 "enabling filtering\n", lpar_rc);
1196 }
1197 }
1198 }
1199
1200 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1201 {
1202 struct ibmveth_adapter *adapter = netdev_priv(dev);
1203 struct vio_dev *viodev = adapter->vdev;
1204 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1205 int i, rc;
1206 int need_restart = 0;
1207
1208 if (new_mtu < IBMVETH_MIN_MTU)
1209 return -EINVAL;
1210
1211 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1212 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1213 break;
1214
1215 if (i == IBMVETH_NUM_BUFF_POOLS)
1216 return -EINVAL;
1217
1218 /* Deactivate all the buffer pools so that the next loop can activate
1219 only the buffer pools necessary to hold the new MTU */
1220 if (netif_running(adapter->netdev)) {
1221 need_restart = 1;
1222 adapter->pool_config = 1;
1223 ibmveth_close(adapter->netdev);
1224 adapter->pool_config = 0;
1225 }
1226
1227 /* Look for an active buffer pool that can hold the new MTU */
1228 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1229 adapter->rx_buff_pool[i].active = 1;
1230
1231 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1232 dev->mtu = new_mtu;
1233 vio_cmo_set_dev_desired(viodev,
1234 ibmveth_get_desired_dma
1235 (viodev));
1236 if (need_restart) {
1237 return ibmveth_open(adapter->netdev);
1238 }
1239 return 0;
1240 }
1241 }
1242
1243 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1244 return rc;
1245
1246 return -EINVAL;
1247 }
1248
1249 #ifdef CONFIG_NET_POLL_CONTROLLER
1250 static void ibmveth_poll_controller(struct net_device *dev)
1251 {
1252 ibmveth_replenish_task(netdev_priv(dev));
1253 ibmveth_interrupt(dev->irq, dev);
1254 }
1255 #endif
1256
1257 /**
1258 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1259 *
1260 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1261 *
1262 * Return value:
1263 * Number of bytes of IO data the driver will need to perform well.
1264 */
1265 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1266 {
1267 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1268 struct ibmveth_adapter *adapter;
1269 unsigned long ret;
1270 int i;
1271 int rxqentries = 1;
1272
1273 /* netdev inits at probe time along with the structures we need below*/
1274 if (netdev == NULL)
1275 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1276
1277 adapter = netdev_priv(netdev);
1278
1279 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1280 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1281
1282 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1283 /* add the size of the active receive buffers */
1284 if (adapter->rx_buff_pool[i].active)
1285 ret +=
1286 adapter->rx_buff_pool[i].size *
1287 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1288 buff_size);
1289 rxqentries += adapter->rx_buff_pool[i].size;
1290 }
1291 /* add the size of the receive queue entries */
1292 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1293
1294 return ret;
1295 }
1296
1297 static const struct net_device_ops ibmveth_netdev_ops = {
1298 .ndo_open = ibmveth_open,
1299 .ndo_stop = ibmveth_close,
1300 .ndo_start_xmit = ibmveth_start_xmit,
1301 .ndo_set_multicast_list = ibmveth_set_multicast_list,
1302 .ndo_do_ioctl = ibmveth_ioctl,
1303 .ndo_change_mtu = ibmveth_change_mtu,
1304 .ndo_fix_features = ibmveth_fix_features,
1305 .ndo_set_features = ibmveth_set_features,
1306 .ndo_validate_addr = eth_validate_addr,
1307 .ndo_set_mac_address = eth_mac_addr,
1308 #ifdef CONFIG_NET_POLL_CONTROLLER
1309 .ndo_poll_controller = ibmveth_poll_controller,
1310 #endif
1311 };
1312
1313 static int __devinit ibmveth_probe(struct vio_dev *dev,
1314 const struct vio_device_id *id)
1315 {
1316 int rc, i;
1317 struct net_device *netdev;
1318 struct ibmveth_adapter *adapter;
1319 unsigned char *mac_addr_p;
1320 unsigned int *mcastFilterSize_p;
1321
1322 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1323 dev->unit_address);
1324
1325 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1326 NULL);
1327 if (!mac_addr_p) {
1328 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1329 return -EINVAL;
1330 }
1331
1332 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1333 VETH_MCAST_FILTER_SIZE, NULL);
1334 if (!mcastFilterSize_p) {
1335 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1336 "attribute\n");
1337 return -EINVAL;
1338 }
1339
1340 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1341
1342 if (!netdev)
1343 return -ENOMEM;
1344
1345 adapter = netdev_priv(netdev);
1346 dev_set_drvdata(&dev->dev, netdev);
1347
1348 adapter->vdev = dev;
1349 adapter->netdev = netdev;
1350 adapter->mcastFilterSize = *mcastFilterSize_p;
1351 adapter->pool_config = 0;
1352
1353 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1354
1355 /*
1356 * Some older boxes running PHYP non-natively have an OF that returns
1357 * a 8-byte local-mac-address field (and the first 2 bytes have to be
1358 * ignored) while newer boxes' OF return a 6-byte field. Note that
1359 * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1360 * The RPA doc specifies that the first byte must be 10b, so we'll
1361 * just look for it to solve this 8 vs. 6 byte field issue
1362 */
1363 if ((*mac_addr_p & 0x3) != 0x02)
1364 mac_addr_p += 2;
1365
1366 adapter->mac_addr = 0;
1367 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1368
1369 netdev->irq = dev->irq;
1370 netdev->netdev_ops = &ibmveth_netdev_ops;
1371 netdev->ethtool_ops = &netdev_ethtool_ops;
1372 SET_NETDEV_DEV(netdev, &dev->dev);
1373 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1374 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1375 netdev->features |= netdev->hw_features;
1376
1377 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1378
1379 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1380 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1381 int error;
1382
1383 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1384 pool_count[i], pool_size[i],
1385 pool_active[i]);
1386 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1387 &dev->dev.kobj, "pool%d", i);
1388 if (!error)
1389 kobject_uevent(kobj, KOBJ_ADD);
1390 }
1391
1392 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1393
1394 adapter->buffer_list_dma = DMA_ERROR_CODE;
1395 adapter->filter_list_dma = DMA_ERROR_CODE;
1396 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1397
1398 netdev_dbg(netdev, "registering netdev...\n");
1399
1400 ibmveth_set_features(netdev, netdev->features);
1401
1402 rc = register_netdev(netdev);
1403
1404 if (rc) {
1405 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1406 free_netdev(netdev);
1407 return rc;
1408 }
1409
1410 netdev_dbg(netdev, "registered\n");
1411
1412 return 0;
1413 }
1414
1415 static int __devexit ibmveth_remove(struct vio_dev *dev)
1416 {
1417 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1418 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1419 int i;
1420
1421 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1422 kobject_put(&adapter->rx_buff_pool[i].kobj);
1423
1424 unregister_netdev(netdev);
1425
1426 free_netdev(netdev);
1427 dev_set_drvdata(&dev->dev, NULL);
1428
1429 return 0;
1430 }
1431
1432 static struct attribute veth_active_attr;
1433 static struct attribute veth_num_attr;
1434 static struct attribute veth_size_attr;
1435
1436 static ssize_t veth_pool_show(struct kobject *kobj,
1437 struct attribute *attr, char *buf)
1438 {
1439 struct ibmveth_buff_pool *pool = container_of(kobj,
1440 struct ibmveth_buff_pool,
1441 kobj);
1442
1443 if (attr == &veth_active_attr)
1444 return sprintf(buf, "%d\n", pool->active);
1445 else if (attr == &veth_num_attr)
1446 return sprintf(buf, "%d\n", pool->size);
1447 else if (attr == &veth_size_attr)
1448 return sprintf(buf, "%d\n", pool->buff_size);
1449 return 0;
1450 }
1451
1452 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1453 const char *buf, size_t count)
1454 {
1455 struct ibmveth_buff_pool *pool = container_of(kobj,
1456 struct ibmveth_buff_pool,
1457 kobj);
1458 struct net_device *netdev = dev_get_drvdata(
1459 container_of(kobj->parent, struct device, kobj));
1460 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1461 long value = simple_strtol(buf, NULL, 10);
1462 long rc;
1463
1464 if (attr == &veth_active_attr) {
1465 if (value && !pool->active) {
1466 if (netif_running(netdev)) {
1467 if (ibmveth_alloc_buffer_pool(pool)) {
1468 netdev_err(netdev,
1469 "unable to alloc pool\n");
1470 return -ENOMEM;
1471 }
1472 pool->active = 1;
1473 adapter->pool_config = 1;
1474 ibmveth_close(netdev);
1475 adapter->pool_config = 0;
1476 if ((rc = ibmveth_open(netdev)))
1477 return rc;
1478 } else {
1479 pool->active = 1;
1480 }
1481 } else if (!value && pool->active) {
1482 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1483 int i;
1484 /* Make sure there is a buffer pool with buffers that
1485 can hold a packet of the size of the MTU */
1486 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1487 if (pool == &adapter->rx_buff_pool[i])
1488 continue;
1489 if (!adapter->rx_buff_pool[i].active)
1490 continue;
1491 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1492 break;
1493 }
1494
1495 if (i == IBMVETH_NUM_BUFF_POOLS) {
1496 netdev_err(netdev, "no active pool >= MTU\n");
1497 return -EPERM;
1498 }
1499
1500 if (netif_running(netdev)) {
1501 adapter->pool_config = 1;
1502 ibmveth_close(netdev);
1503 pool->active = 0;
1504 adapter->pool_config = 0;
1505 if ((rc = ibmveth_open(netdev)))
1506 return rc;
1507 }
1508 pool->active = 0;
1509 }
1510 } else if (attr == &veth_num_attr) {
1511 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1512 return -EINVAL;
1513 } else {
1514 if (netif_running(netdev)) {
1515 adapter->pool_config = 1;
1516 ibmveth_close(netdev);
1517 adapter->pool_config = 0;
1518 pool->size = value;
1519 if ((rc = ibmveth_open(netdev)))
1520 return rc;
1521 } else {
1522 pool->size = value;
1523 }
1524 }
1525 } else if (attr == &veth_size_attr) {
1526 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1527 return -EINVAL;
1528 } else {
1529 if (netif_running(netdev)) {
1530 adapter->pool_config = 1;
1531 ibmveth_close(netdev);
1532 adapter->pool_config = 0;
1533 pool->buff_size = value;
1534 if ((rc = ibmveth_open(netdev)))
1535 return rc;
1536 } else {
1537 pool->buff_size = value;
1538 }
1539 }
1540 }
1541
1542 /* kick the interrupt handler to allocate/deallocate pools */
1543 ibmveth_interrupt(netdev->irq, netdev);
1544 return count;
1545 }
1546
1547
1548 #define ATTR(_name, _mode) \
1549 struct attribute veth_##_name##_attr = { \
1550 .name = __stringify(_name), .mode = _mode, \
1551 };
1552
1553 static ATTR(active, 0644);
1554 static ATTR(num, 0644);
1555 static ATTR(size, 0644);
1556
1557 static struct attribute *veth_pool_attrs[] = {
1558 &veth_active_attr,
1559 &veth_num_attr,
1560 &veth_size_attr,
1561 NULL,
1562 };
1563
1564 static const struct sysfs_ops veth_pool_ops = {
1565 .show = veth_pool_show,
1566 .store = veth_pool_store,
1567 };
1568
1569 static struct kobj_type ktype_veth_pool = {
1570 .release = NULL,
1571 .sysfs_ops = &veth_pool_ops,
1572 .default_attrs = veth_pool_attrs,
1573 };
1574
1575 static int ibmveth_resume(struct device *dev)
1576 {
1577 struct net_device *netdev = dev_get_drvdata(dev);
1578 ibmveth_interrupt(netdev->irq, netdev);
1579 return 0;
1580 }
1581
1582 static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1583 { "network", "IBM,l-lan"},
1584 { "", "" }
1585 };
1586 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1587
1588 static struct dev_pm_ops ibmveth_pm_ops = {
1589 .resume = ibmveth_resume
1590 };
1591
1592 static struct vio_driver ibmveth_driver = {
1593 .id_table = ibmveth_device_table,
1594 .probe = ibmveth_probe,
1595 .remove = ibmveth_remove,
1596 .get_desired_dma = ibmveth_get_desired_dma,
1597 .driver = {
1598 .name = ibmveth_driver_name,
1599 .owner = THIS_MODULE,
1600 .pm = &ibmveth_pm_ops,
1601 }
1602 };
1603
1604 static int __init ibmveth_module_init(void)
1605 {
1606 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1607 ibmveth_driver_string, ibmveth_driver_version);
1608
1609 return vio_register_driver(&ibmveth_driver);
1610 }
1611
1612 static void __exit ibmveth_module_exit(void)
1613 {
1614 vio_unregister_driver(&ibmveth_driver);
1615 }
1616
1617 module_init(ibmveth_module_init);
1618 module_exit(ibmveth_module_exit);
kernel-based virtual machine